Soil Macrofauna as Indicators in Tree Legume Revegetation

ABSTRACT The study was conducted in an area of abandoned pasture located in the city of Valença (RJ) revegetated with tree legumes. Different proportions of nitrogen-fixing leguminous trees were used: 0% (0L), 25% (25L), 50% (50L) and 75% (75L). For evaluation of soil biota, samplings were made in the end of the dry season and in the rainy season. Samples were collected in the abandoned pasture, in a secondary forest, and in two grassland areas (PA and PB). The process of reforestation has increased the overall diversity of soil fauna. Formicidae was the group that stood out, being abundant in all treatments and in the two periods of collection. During the rainy season, a considerable increase in the amount of invertebrates in the litter layer was observed in the treatments 0L, 25L, 50L, 75L and in the secondary forest, while during the dry season, such increase occurred in the 0-10 cm layer.

摘要 本研究在巴西里约热内卢州瓦伦萨市一处经豆科树木植被恢复的弃牧草地开展。实验设置了不同比例的固氮豆科树木处理组：0%（0L）、25%（25L）、50%（50L）及75%（75L）。为评估土壤生物群，分别于旱季末期与雨季开展采样工作，采样样地涵盖弃牧草地、次生林以及两个草地样区（PA与PB）。研究结果表明，造林修复过程提升了土壤动物群落的整体多样性。蚁科（Formicidae）为优势类群，在所有处理组与两个采样时期均具有较高丰度。雨季期间，0L、25L、50L、75L组及次生林的枯落物层无脊椎动物数量出现显著增长；而旱季期间，该数量增长则出现在0-10 cm土层中。